Our single thread countersunk pozi drive yellow finish wood screws, used for softwood applications, come in a wide variety of sizes from M3.5 to M6 with ranging lengths of 15mm to 100mm. Dependant on the size of the screw they come in boxes of 100’s or 200’s. These have a better fix into upvc than twinthread screws as the threads are more spaced out. Prices for outer box quantities are lower as these take us less time to pick and pack.